C language ToUpper () function: Converts lowercase letters to uppercase letters

Header files: #include <ctype.h>

Definition function: int toupper (int c);

Function Description: If the parameter c is a lowercase letter, the corresponding uppercase letter is returned.

Return value: Returns the converted uppercase letter, returning the parameter C value if no conversion is required.

Example: Converts lowercase letters within the s string to uppercase letters.

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#include <ctype.h> main () {char s[] = "abcdefgh12345;! #$"; int i; printf ("Before ToUpper ():%s\n", s); for (i = 0; i < sizeof (s); i++) S[i] = ToUpper (s[i)); printf ("After ToUpper ():%s\n", s); }
Execution results:
Before ToUpper (): abcdefgh12345;! #$
After ToUpper (): abcdefgh12345;! #$